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NAME

       gnutls_prf_raw - API function

SYNOPSIS

       #include <gnutls/gnutls.h>

       int gnutls_prf_raw(gnutls_session_t session, size_t label_size, const char * label, size_t
       seed_size, const char * seed, size_t outsize, char * out);

ARGUMENTS

       gnutls_session_t session
                   is a gnutls_session_t structure.

       size_t label_size
                   length of the label variable.

       const char * label
                   label used in PRF computation, typically a short string.

       size_t seed_size
                   length of the seed variable.

       const char * seed
                   optional extra data to seed the PRF with.

       size_t outsize
                   size of pre-allocated output buffer to hold the output.

       char * out  pre-allocate buffer to hold the generated data.

DESCRIPTION

       Apply the TLS Pseudo-Random-Function (PRF) using the master secret on some data.

       The label variable usually contain a string denoting the purpose for the  generated  data.
       The  seed usually contain data such as the client and server random, perhaps together with
       some additional data that is added to guarantee uniqueness of the output for a  particular
       purpose.

       Because  the  output  is  not guaranteed to be unique for a particular session unless seed
       include the client random and server random fields (the PRF would output the same data  on
       another connection resumed from the first one), it is not recommended to use this function
       directly.  The gnutls_prf() function seed the PRF with the client and server random fields
       directly,  and  is  recommended if you want to generate pseudo random data unique for each
       session.

RETURNS

       GNUTLS_E_SUCCESS on success, or an error code.

REPORTING BUGS

       Report      bugs       to       <bug-gnutls@gnu.org>.        GnuTLS       home       page:
       http://www.gnu.org/software/gnutls/      General      help     using     GNU     software:
       http://www.gnu.org/gethelp/

COPYRIGHT

       Copyright © 2008 Free Software Foundation.
       Copying and distribution of this file, with or without modification, are permitted in  any
       medium without royalty provided the copyright notice and this notice are preserved.

SEE ALSO

       The  full  documentation  for  gnutls  is maintained as a Texinfo manual.  If the info and
       gnutls programs are properly installed at your site, the command

              info gnutls

       should give you access to the complete manual.